Finds from a german wwii airfield for I.D Please?

[3pinplug]

Hi all
Can anyone identify any of the following items, they were all found at a WWII disused german airfield but have no idea if wwii german related or not?
Large shotgun type cartridge has RWS on it, another items looks like part of a buckle.
The silver item is very light and appears to plug into something.
Hope you can help?
Thanks
Mark

[m3bobby]

First object looks like a 2 pin electrical connector of sorts.

The large shotgun cart could be a flare cartridge made by Rheinisch-Westfälischen Sprengstofffabrik hence the RWS base marking.

[3pinplug]

Hi m3bobby,
Thankyou for pointers I will check these out.
The connector is a weird one as not sure if modern or luftwaffe related.